Cascade Autovon Co

12727 412th Ave SE North Bend, King County
Facility Site ID: 36296841 Cleanup Site ID: 8879

  • Site Status

  • No Further Action

More about cleanup

Where the tanks were once located
Where the tanks were once located

Ecology issued a No Further Action Letter for this site on August 9, 2019. 

Site Background

The Site is located in a mixed commercial/residential area in North Bend. A 10,000-square foot structural steel building is present on the central portion of the Site. The Site was initially developed in 1960s and used as a telecommunications facility until 2012. The Site has not been used and the building is unoccupied since 2012.

Telecommunications systems require emergency power to be supplied. Two generations of diesel underground storage tanks (USTs) was present at the Site to store diesel fuel for emergency power generators.  A first generation consisted of two 10,000-gallon diesel USTs; a second generation consisted of one 5,000-gallon diesel UST. All USTs were removed from the Site.

Ecology received a petroleum product release notification in June 1991 during site UST removal activity.

Cleanup Conducted

Cleanup work consisted of the following:

  • Two 10,000-gallon diesel USTs were removed in 1991 and one 5,000-gallon diesel UST were removed in 2007.
  • In 1991 Approximately 350 cubic yards of petroleum contaminated soil was removed from the UST excavation. Groundwater encountered in the excavation was pumped out and disposed of offsite.
  • In 1992 three monitoring wells were installed around the former UST. Groundwater samples collected from 1992 – 1995 were below the state cleanup standards.  The three monitoring wells were properly decommissioned in 2018.
  • In 2016 and 2017 six soil borings were sampled around the former UST. All soil and groundwater samples collected from these borings were below the state cleanup standards.

    • The site cleanup qualifies for Groundwater Model Remedy No. 1, because the contaminated soil was removed to the greatest degree practical, and because soil and groundwater at the site are in compliance with state cleanup standards.

    Contaminants Of Concern

    ·         Diesel-range petroleum hydrocarbons (TPHd) into the Soil.

    ·         TPHd into the Ground Water.

    Voluntary Cleanup Program

    This site was cleaned up under our Voluntary Cleanup Program, which provides technical help to owners of contaminated sites.

    Voluntary Cleanup Program customers pay fees to cover our costs for technical help and reviewing cleanup reports. Sites in this program must meet the same cleanup standards as the sites Ecology manages under legal orders.

    Places to see print documents
    Leaking Underground Storage Tank 1
    Document Title Document Date Document Type
    Cascade Autovon Co - Environmental Site Assessment 11/12/1991 LUST - Site Assessment Report
    Public Information 1
    Document Title Document Date Document Type
    Cascade Autovon Cleanup Site delisting 7/9/2018 Fact Sheet\Public Notices
    Technical Reports 14
    Document Title Document Date Document Type
    Cascade Autovon Co - Remedial Investigation Report Version 3 1/25/2018 Remedial Investigation Report
    Cascade Autovon Co - NW3098 Request for Additional Information on a VCP Submittal 4/27/2017 Site Specific Administrative Document - other (Administrative correspondence)
    Cascade Autovon Co - Remedial Investigation Report 9/30/2016 Remedial Investigation Report
    Cascade Autovon Co - Site Hazard Assessment 6/28/2013 Site Hazard Assessment Report
    Cascade Autovon Co - SHA Notification Letter 5/7/2013 Site Specific Administrative Document - other (Administrative correspondence)
    Cascade Autovan Co.—Initial Investigation Report LUST 2342 4/20/2011 Initial Investigation Report
    Cascade Autovon Co - Monitoring Well Yearly Round Groundwater Sampling Event March 1995 5/8/1995 Groundwater Monitoring Report
    Cascade Autovon Co - Groundwater Sampling and Analytical Results February 1994 3/14/1994 Groundwater Monitoring Report
    Cascade Autovon Co - Monitoring Well 4th Quarterly Monitoring Event December 1992 1/25/1993 Groundwater Monitoring Report
    Cascade Autovon Co - Bioremediation Process 9/29/1992 Site Specific Technical Document - other
    Cascade Autovon Co - Monitoring Well 3rd Quarterly Monitoring Event September 1992 9/29/1992 Groundwater Monitoring Report
    Cascade Autovon Co - Monitoring Well 2nd Quarterly Monitoring Event June 1992 6/25/1992 Groundwater Monitoring Report
    Cascade Autovon Co - Monitoring Well Quarterly Sampling Event Feburary 1992 4/16/1992 Groundwater Monitoring Report
    Cascade Autovon Co - Pumping and Treatment of UST Tank Excavation Water 2/28/1992 Site Specific Technical Document - other
    Voluntary Cleanup Program 2
    Document Title Document Date Document Type
    Cascade Autovon Co - NW3098 NFA Letter 8/9/2018 VCP Opinion on Site Cleanup – NFA
    Cascade Autovon Co - NW3098 Opinion Letter 8/31/2017 Voluntary Cleanup Program Opinion – Other
    There may be more documents related to this site. To obtain documents not available electronically, you will need to make a public records request.

    Places to see print documents

    • Northwest Regional Office
      15700 Dayton Ave N
      Shoreline, 98133
      Please schedule an appointment to view print documents at this location.

    Contaminants 1

    Contaminant Type
    Soil
    Groundwater
    Surface Water
    Air
    Sediment
    Bedrock
    Non-Halogenated Organics - Petroleum-Diesel RB B
    S
    Suspected
    C
    Confirmed Above Cleanup Levels
    B
    Below Cleanup Levels
    RA
    Remediated-Above
    RB
    Remediated-Below
    R
    Remediated
    This contaminant list was based on our best information at the time it was entered. It may not reflect current conditions at the site.